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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ab1fc0c02e3f982bf29071bf6ec3feaf3e9734c73047a97e33ebe7dbf3acff' 
  AND token = 'SFKcAk6F/Uap9B8cxKsXLx4wq1Gf/rRgAczYuAuDLAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}